PTILODACTYLA. 633 



Two males. Easily separable from its allies by the depressed, obsoletely striate disc 

 of the elytra. The antenna? are rather stout, with shorter rami than in the males of 

 P. nigrieornis, P. rufa, &c; the apical joint is unusually stout. 



7. Ptilodactyla gibbicollis. 



c? • Elliptic, short, convex, very shining ; somewhat thickly clothed with very short, fine, ashy pubescence, 

 the elytra with sparser and darker pubescence ; black, the antennae and legs piceous, the tarsi obscure 

 testaceous ; the upper and under surfaces somewhat thickly and very finely, the head and the flanks 

 of the prothorax more densely, punctate. Head very broad, the eyes comparatively small; antennae 

 slender, fully as long as the body, joints 4-10 each with a long slender ramus, the outer rami very much 

 longer than the joints themselves. Prothorax moderately transverse, compressed at the sides ante- 

 riorly, strongly gibbous in front, the apex acutely margined in the centre, the sides somewhat obliquely 

 converging from the base, rounded anteriorly, and acutely margined from the base to a little beyond the 

 middle, the hind angles acute ; the base bisinuate, strongly denticulate, and with three longer teeth 

 opposite the scutellum. Scutellum rugulose, very deeply notched in the centre in front, and with a 

 shallow median sulcus extending thence to the apex. Elytra short, of the same width as the prothorax, 

 subparallel in their basal half and conjointly rounded at the apex, compressed laterally below the shoulders, 

 appearing acutely margined at the sides, flattened on the disc at the base, with a short indistinct sutural 

 stria, the humeri rectangular. 



Length 3, breadth 1^ millim. 



Ilab. Panama, Bugaba {Champion). 



One specimen, in a bad state of preservation. Differs from all the allied forms in 

 the gibbous, relatively long thorax. The antenna? are long and slender, with long 

 slender rami. The base of the thorax is not arcuate-emarginate opposite the scutellum 

 (as in P. ehenina, &c), and is very distinctly denticulate throughout. The elytra are 

 compressed at the sides below the shoulders, which are rectangular and rather prominent. 

 The pubescence, above and beneath, is more distinct than in most of the allied species. 



8. Ptilodactyla convexicollis. 



Elliptic, short, convex, shining ; above and beneath somewhat thickly clothed with very short, fine, appressed, 

 yellowish-cinereous pubescence ; reddish-brown or rufo-testaceous, the antennae testaceous, with joints 

 6-9 or 7-9 usually infuscate, the eyes black, the legs testaceous, with the tibiae often darker; the 

 upper surface thickly, very finely punctate, the under surface more coarsely punctured. Head broad, the 

 eyes large and somewhat prominent ; antennae rather slender, nearly as long as the body, joints 4-10 each 

 with a short ramus in the male and gradually becoming more distinctly serrate in the female. Prothorax 

 short, transversely convex in front, widest a little before the base, the sides rounded, converging anteriorly, 

 and sharply margined, subparallel behind, the hind angles acute ; the base trisinuate, finely denticulate, 

 and with a short projecting tooth in the centre. Scutellum deeply notched in the centre in front and with 

 a narrow well-defined median sulcus extending thence to the apex. Elytra short, wider than the 

 prothorax, subparallel in their basal half, narrowly margined, rather sharply produced at the apex, and 

 with a short sutural stria at the base. Eifth ventral segment arcuate-emarginate at the apex in the 

 male. Tarsal claws with a rectangular tooth in both sexes. 



Length 3|-4J, breadth ] f-2 millim. ( c? $ •) 



Hab. Mexico, Cordova (Salle), Teapa in Tabasco (Salle, Hoge, H. H. Smith) ; British 

 Honduras, Belize (Blancaneaux) ; Guatemala, San Juan and Cubilguitz in Vera Paz, 

 Cerro Zunil (Champion). 



biol. CENTE.-AMER., Coleopt., Vol. III. Pt. 1, May 1897. 4M 



